Vitamin A, Zinc, Iron and Folic Acid: study protocols
10 study groups took Vitamin A together with Zinc, Iron and Folic Acid. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin A
10 study groups in 8 studies say how much Vitamin A participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 500 mcg to 1 mg, 60% of 10 study groups.
| Daily dose | Study groups |
|---|---|
| 250 mcg to 500 mcg | 4 |
| 500 mcg to 1 mg | 6 |
Dose per serving from research: Zinc
10 study groups in 8 studies say how much Zinc participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 25 mg to 50 mg, 40% of 10 study groups.
| Daily dose | Study groups |
|---|---|
| 2.5 mg to 5 mg | 3 |
| 5 mg to 10 mg | 1 |
| 10 mg to 25 mg | 2 |
| 25 mg to 50 mg | 4 |
Dose per serving from research: Iron
9 study groups in 8 studies say how much Iron participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 25 mg to 50 mg and 50 mg to 100 mg, 33% of 9 study groups each.
| Daily dose | Study groups |
|---|---|
| 5 mg to 10 mg | 2 |
| 10 mg to 25 mg | 1 |
| 25 mg to 50 mg | 3 |
| 50 mg to 100 mg | 3 |
Dose per serving from research: Folic Acid
10 study groups in 8 studies say how much Folic Acid participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 100 mcg to 250 mcg and 250 mcg to 500 mcg, 40% of 10 study groups each.
| Daily dose | Study groups |
|---|---|
| 100 mcg to 250 mcg | 4 |
| 250 mcg to 500 mcg | 4 |
| 500 mcg to 1 mg | 2 |
Commonly used together
8 of 10 study groups took Vitamin A, Zinc, Iron and Folic Acid with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Vitamin C | 6 |
| Vitamin B12 | 5 |
| Copper | 4 |
| Vitamin E | 4 |
| Iodine | 3 |
| Selenium | 3 |
| Vitamin B6 | 3 |
| Vitamin D | 3 |
10 study groups